Which of the following conditions favor the development of a wave-cut platform?
(1) Active hydraulic action and abrasion
(2) Steep coastal profile
(3) Continuous rapid deposition of sediments
(4) Waves approaching parallel to the coastline
- A.(1) and (2) only
- B.(1) and (3) only
- C.(2) and (4) only
- D.(3) and (4) only
Worked solution
Statement (1) is correct as hydraulic action and abrasion are the primary marine processes that erode the cliff base to form a wave-cut notch. Statement (2) is correct because a steep coastal profile allows deep water near the shore, preventing waves from breaking early and ensuring high wave energy directly attacks the cliff face. Statement (3) is incorrect because rapid sediment deposition would cover the rocky platform, protecting it from further wave erosion. Statement (4) is incorrect because although wave refraction shapes coasts, parallel wave approach is not a necessary condition for platform development.
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
Which of the following are the major obstacles to implementing "redevelopment" compared to "rehabilitation" in old urban areas of Hong Kong?
(1) Fragmented property ownership
(2) High financial compensation costs
(3) Complete loss of local social networks
(4) Inability to improve the local road network
- A.(1) and (2) only
- B.(1) and (3) only
- C.(2) and (4) only
- D.(3) and (4) only
Worked solution
Statements (1) and (2) are correct. Acquiring fragmented property titles from numerous individual owners in old buildings is a highly time-consuming obstacle, and the statutory financial compensation (such as Home Purchase Allowance) represents a massive financial burden for developers or the Urban Renewal Authority. Statement (3) is a social consequence/impact of redevelopment, not an obstacle to implementing it. Statement (4) is incorrect because redevelopment allows for comprehensive replanning of land use, which actually facilitates road widening and improvement, whereas rehabilitation (which only repairs existing structures) does not allow for road improvement.
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
The biomass, soil, and litter are the three major nutrient pools in a terrestrial ecosystem. If large-scale commercial logging is carried out in an undisturbed tropical rainforest, how will the biomass pool and soil pool change?
- A.Biomass pool increases, soil pool decreases
- B.Biomass pool decreases, soil pool decreases
- C.Litter pool increases, soil pool increases
- D.Litter pool decreases, soil pool increases
Worked solution
Commercial logging directly removes trees, leading to a massive decrease in the biomass pool. With the loss of forest canopy protecting the ground, heavy tropical rainfall directly washes away the topsoil (accelerated soil erosion) and leaches nutrients deep down, while the lack of leaf litter input prevents replenishment. Consequently, the soil nutrient pool also decreases drastically.
Marking scheme
Award 1 mark for the correct answer B. No marks are given for incorrect answers.
Which of the following flowcharts correctly represents the positive feedback loop of melting Arctic sea ice?
- A.Rise in global temperature -> Melting of Arctic sea ice -> Decrease in planetary albedo -> Increase in absorption of solar radiation -> Rise in global temperature
- B.Rise in global temperature -> Melting of Arctic sea ice -> Increase in planetary albedo -> Increase in reflection of solar radiation -> Fall in global temperature
- C.Rise in global temperature -> Increase in evaporation -> Increase in low cloud cover -> Increase in reflection of solar radiation -> Fall in global temperature
- D.Rise in global temperature -> Thawing of permafrost -> Absorption of methane by soil -> Decrease in greenhouse effect -> Fall in global temperature
Worked solution
A positive feedback loop is a self-reinforcing process. Option A correctly traces this: rising global temperatures melt Arctic sea ice, replacing reflective ice with dark ocean water. This decreases the planetary albedo (reflectivity), causing the Earth's surface to absorb more solar radiation, which further elevates the global temperature, reinforcing the loop. Option B describes a negative feedback (and contains incorrect physical links). Option C is a cloud-radiation feedback which acts as a negative feedback. Option D incorrectly states that soil absorbs methane when permafrost thaws (permafrost thawing actually releases methane, increasing the greenhouse effect).
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
A group of students wants to investigate the "urban heat island effect" in a commercial district. Which of the following data collection methods can minimize the influence of extraneous variables?
(1) Measuring air temperature at different sites at the same time of day.
(2) Placing the digital thermometer under direct sunlight at all sites.
(3) Taking temperature readings at a standard height of 1.5 meters above ground.
(4) Selecting sites with identical wind directions and speeds.
- A.(1) and (2) only
- B.(1) and (3) only
- C.(2) and (4) only
- D.(3) and (4) only
Worked solution
Statement (1) is correct because air temperature varies throughout the day; simultaneous measurement controls the temporal variable. Statement (3) is correct because a standard height of 1.5m avoids ground conduction and controls the vertical gradient variable. Statement (2) is incorrect because direct sunlight heats the thermometer sensor directly, causing inaccurate air temperature readings (they should be shaded). Statement (4) is incorrect because wind patterns are highly altered by local buildings and topography, making it practically impossible to select sites with identical wind conditions; furthermore, wind is an inherent part of the microclimate being studied.
Marking scheme
Award 1 mark for the correct answer B. No marks are given for incorrect answers.
Which of the following reasons explain why the Shougang Group relocated its production plant from Beijing to Caofeidian (Hebei Province) in the 2000s?
(1) To reduce air pollution in the capital city before the Olympic Games.
(2) To utilize the deep-water port at Caofeidian for importing iron ore.
(3) To be closer to the market in Western China.
(4) To exploit the rich local iron ore deposits in Caofeidian.
- A.(1) and (2) only
- B.(1) and (4) only
- C.(2) and (3) only
- D.(3) and (4) only
Worked solution
Statements (1) and (2) are correct. Shougang's relocation was heavily driven by the government's mandate to improve Beijing's air quality prior to the 2008 Olympics. Caofeidian, as a deep-water port, allowed Shougang to transition from a resource-based location to a coastal location, facilitating the import of high-grade raw materials (iron ore and coal) via cheap maritime transport. Statement (3) is incorrect because Caofeidian is located on the coast of Northern China, far from Western China. Statement (4) is incorrect because Caofeidian itself does not possess rich mineral deposits; the plant relies on imported materials.
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
Which of the following is a human-induced root cause of chronic food shortage in the Sahel region?
- A.High variability of annual rainfall leading to frequent droughts
- B.Rapid population growth exceeding the carrying capacity of agricultural land
- C.Severe locust infestations destroying staple crops
- D.Low water-holding capacity of sandy soils
Worked solution
The question specifies a "human-induced root cause". Option B (rapid population growth) is a major human factor that leads to overcultivation and overgrazing, exceeding the carrying capacity of the marginal land and triggering desertification. Options A, C, and D are physical/natural factors (climatic variability, biological hazards, and soil characteristics respectively).
Marking scheme
Award 1 mark for the correct answer B. No marks are given for incorrect answers.
Which of the following physical conditions in Hong Kong make its hillslopes highly susceptible to mass wasting?
(1) Deeply weathered granitic rocks
(2) High density of vegetation cover
(3) Intense rainfall during summer monsoons
(4) Gentle slope gradients in suburban areas
- A.(1) and (3) only
- B.(1) and (4) only
- C.(2) and (3) only
- D.(2) and (4) only
Worked solution
Statements (1) and (3) are correct. Granite in Hong Kong is highly susceptible to deep chemical weathering under the hot and wet climate, leaving a thick layer of loose regolith. Intense summer rainfall increases pore water pressure and weight of this regolith, triggering landslides. Statement (2) is incorrect because vegetation roots bind soil and reduce infiltration, stabilizing slopes. Statement (4) is incorrect because gentle slopes decrease shear stress and lower the risk of mass wasting compared to steep slopes.
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
Which of the following sets of atmospheric and oceanic conditions is essential for the formation of a typhoon in the western North Pacific?
- A.Sea surface temperature above \(26.5^\circ\text{C}\), weak vertical wind shear, high Coriolis force
- B.Sea surface temperature below \(20^\circ\text{C}\), strong vertical wind shear, high Coriolis force
- C.Sea surface temperature above \(26.5^\circ\text{C}\), strong vertical wind shear, zero Coriolis force at the equator
- D.Sea surface temperature below \(20^\circ\text{C}\), weak vertical wind shear, zero Coriolis force at the equator
Worked solution
For a tropical cyclone (typhoon) to form, three key conditions must be met: (1) Sea surface temperatures must be above \(26.5^\circ\text{C}\) to provide ample heat and moisture. (2) Vertical wind shear must be weak so the warm air column can rise vertically without being disrupted. (3) High Coriolis force (occurring at least \(5^\circ\) latitude away from the equator) is needed to rotate the converging air. Therefore, Option A is correct.
Marking scheme
Award 1 mark for the correct answer A. No marks are given for incorrect answers.
Which of the following factors has driven the industrial restructuring of the Zhujiang Delta (PRD) region from "labor-intensive" to "high-tech" industries since the 2000s?
(1) Increasing land prices and labor wages in the PRD
(2) The implementation of the "Double Transfer" policy by the Guangdong government
(3) The discovery of rich local mineral resources in the PRD
(4) The appreciation of the Renminbi making export of cheap goods less competitive
- A.(1), (2) and (3) only
- B.(1), (2) and (4) only
- C.(1), (3) and (4) only
- D.(2), (3) and (4) only
Worked solution
Statements (1), (2), and (4) are correct. Rising land and labor costs in the PRD reduced the profit margins of labor-intensive industries. The Guangdong government's "Double Transfer" policy actively pushed labor-intensive factories out of the PRD to peripheral region and pulled high-tech, modern service industries into the PRD. The appreciation of the Renminbi also made cheap export goods less competitive, forcing industrial upgrading. Statement (3) is incorrect because the PRD has always been poor in mineral resources; its growth was never driven by local minerals.
Marking scheme
Award 1 mark for the correct answer B. No marks are given for incorrect answers.
Which of the following statements about constructive waves are correct?
1. The swash is stronger than the backwash.
2. They have a high wave frequency of over 15 waves per minute.
3. They are associated with the formation of depositional coastal landforms.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is correct because constructive waves have a stronger swash which carries and deposits sediment onto the beach, and a weaker backwash. Statement 2 is incorrect because constructive waves have a low wave frequency (usually 6 to 9 waves per minute), whereas destructive waves have a high frequency. Statement 3 is correct as the dominant swash leads to net deposition, building up beaches and other depositional landforms. Therefore, the correct option is B.
Marking scheme
Award 1 mark for selecting the correct option B. No marks are given for other options.
Which of the following is a key environmental benefit of 'rehabilitation' compared to 'redevelopment' in the urban renewal of Hong Kong?
- A.Preserving existing building structures to reduce construction and demolition waste
- B.Increasing the residential plot ratio to maximize housing supply
- C.Widening narrow roads to improve local air ventilation
- D.Providing large-scale underground car parks to relieve roadside parking pressure
Worked solution
Rehabilitation involves repairing and restoring existing buildings rather than demolishing them. This significantly reduces the volume of construction and demolition waste disposed of in landfills, conserving resources and reducing environmental impacts compared to complete redevelopment. Options B, C, and D are typically outcomes of redevelopment.
Marking scheme
Award 1 mark for selecting the correct option A. No marks are given for other options.
Despite the massive biomass in tropical rainforests, the soil nutrient pool is relatively small. Which of the following are the reasons for this phenomenon?
1. Rapid nutrient uptake by dense and abundant vegetation.
2. Intense leaching of soil nutrients caused by heavy rainfall.
3. A very slow rate of organic decomposition on the forest floor.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is correct because the dense tropical rainforest vegetation rapidly absorbs nutrients from the soil to support growth. Statement 2 is correct because the heavy and frequent rainfall in equatorial regions causes rapid leaching of soluble nutrients down through the soil profile. Statement 3 is incorrect because high temperatures and humidity in the rainforest promote extremely rapid decomposition of organic matter, not slow decomposition. Therefore, the correct option is A.
Marking scheme
Award 1 mark for selecting the correct option A. No marks are given for other options.
Arrange the following processes in the correct sequence to show how the positive ice-albedo feedback loop accelerates global warming:
1. Decrease in surface albedo
2. Rise in global temperature
3. Melting of glaciers and sea ice
4. Increase in absorption of solar radiation
- A.2 -> 1 -> 3 -> 4
- B.2 -> 3 -> 1 -> 4
- C.3 -> 2 -> 4 -> 1
- D.3 -> 4 -> 1 -> 2
Worked solution
The ice-albedo feedback is a positive feedback loop. It begins with a rise in global temperature (2), which causes the melting of glaciers and sea ice (3). As highly reflective ice is replaced by darker land or ocean surfaces, there is a decrease in surface albedo (1). This leads to an increase in the absorption of solar radiation (4), which further warms the planet, reinforcing the initial temperature rise. Thus, the correct sequence is 2 -> 3 -> 1 -> 4.
Marking scheme
Award 1 mark for selecting the correct option B. No marks are given for other options.
A student group planned a fieldwork study to investigate how traffic noise levels vary with distance away from a busy main road in Mong Kok. Which sampling method is the most appropriate for selecting the measurement locations?
- A.Random sampling
- B.Systematic sampling
- C.Stratified sampling
- D.Opportunistic sampling
Worked solution
Since the objective is to study the change in noise level *with distance* from a specific source (the main road), measurements should be taken at regular, predefined distance intervals (e.g., every 10 meters along a transect line perpendicular to the road). This is a classic application of systematic sampling. Random sampling may miss key intervals, while stratified sampling is used when dividing a population into sub-groups.
Marking scheme
Award 1 mark for selecting the correct option B. No marks are given for other options.
Which of the following factors best explains why major iron and steel plants in China have increasingly relocated to coastal areas since the late 20th century?
1. To utilize local iron ore resources along the coast.
2. To facilitate the import of high-grade raw materials by sea.
3. To access large domestic and international consumer markets.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is incorrect because China's coastal areas generally lack abundant iron ore resources; coastal plants rely heavily on imports. Statement 2 is correct because coastal locations allow giant bulk carriers to dock, facilitating the cheap import of high-grade iron ore from countries like Australia and Brazil. Statement 3 is correct because major coastal cities and economic zones (like the Yangtze River Delta and Pearl River Delta) are the largest markets for steel consumption and allow easy export. Hence, 2 and 3 are correct.
Marking scheme
Award 1 mark for selecting the correct option C. No marks are given for other options.
In the Sahel region of Africa, which of the following are human-induced factors that aggravate soil degradation and lead to severe food shortages?
1. Overgrazing due to growing livestock populations.
2. High variability of annual rainfall.
3. Excessive cultivation of marginal land for cash crops.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is a human factor: overgrazing destroys vegetation cover and compacts soil, leading to soil degradation. Statement 2 is incorrect because high variability of rainfall is a physical/natural factor, not human-induced. Statement 3 is a human factor: farmers over-cultivate fragile marginal lands to grow cash crops for income, depleting soil nutrients and accelerating desertification. Thus, 1 and 3 only are human-induced factors.
Marking scheme
Award 1 mark for selecting the correct option B. No marks are given for other options.
How does heavy and prolonged rainfall trigger a landslide on a soil slope in Hong Kong?
1. It increases the weight (surcharge) of the soil.
2. It increases pore water pressure, reducing the shear strength of the soil.
3. It causes rapid chemical weathering, immediately reducing the cohesion of the soil.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is correct because rain water fills soil pores, increasing soil weight and thus gravitational pull downslope. Statement 2 is correct because high pore water pressure pushes soil particles apart, reducing friction and shear strength. Statement 3 is incorrect because chemical weathering is a long-term geological process and does not occur instantly to trigger a landslide during a single rainfall event. Therefore, the correct option is A.
Marking scheme
Award 1 mark for selecting the correct option A. No marks are given for other options.
Which of the following physical conditions are necessary for the formation of a tropical cyclone?
1. Sea surface temperature of at least \(26.5^\circ\text{C}\).
2. Location at least \(5^\circ\) latitude away from the Equator.
3. Strong vertical wind shear throughout the troposphere.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is correct as high sea surface temperatures (at least \(26.5^\circ\text{C}\)) provide the necessary latent heat energy. Statement 2 is correct because a significant Coriolis force (which is near zero at the Equator and becomes sufficient beyond \(5^\circ\) latitude) is needed to induce the rotational movement of the cyclone. Statement 3 is incorrect because *weak* (not strong) vertical wind shear is required so that the vertical convective structure of the developing cyclone is not torn apart. Therefore, the answer is A.
Marking scheme
Award 1 mark for selecting the correct option A. No marks are given for other options.
Which of the following are the main factors driving industrial restructuring and upgrading in the Zhujiang (Pearl River) Delta since the 2000s?
1. Escalating labor and land costs.
2. Implementation of stricter environmental protection regulations.
3. Exhaustion of local coal and iron resources in the region.
- A.1 and 2 only
- B.1 and 3 only
- C.2 and 3 only
- D.1, 2 and 3
Worked solution
Statement 1 is correct as rapid economic growth led to shortages of cheap labor and land, forcing low-value-added, labor-intensive industries to relocate or upgrade. Statement 2 is correct as local governments implemented policies like 'Emptying the Cage for New Birds' and stricter environmental controls to phase out highly polluting industries. Statement 3 is incorrect because the Zhujiang Delta's early industrialization was never based on local coal and iron resource extraction; it was an export-oriented light manufacturing region. Therefore, the answer is A.
Marking scheme
Award 1 mark for selecting the correct option A. No marks are given for other options.